HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsGrijalva gambusia Grijalva gambusia (Heterophallus milleri) Scientific name: Heterophallus milleri Radda, 1987 The Grijalva gambusia (Heterophallus milleri) is a freshwater fish of the family Poeciliidae. Native range: North America, Mexico. Species factsScientific nameHeterophallus milleriFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; benthopelagicClimateTropicalDistributionNorth America: Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026